摘要
针对龙湖煤矿64号煤层受采空区积水影响下的安全开采问题,基于流固耦合及弹塑性力学理论,采用室内力学实验、数值模拟等方法,分析在采空区积水条件下,工作面推进速度对煤岩层稳定性的影响规律。结果表明:随着工作面的推进,工作面处应力集中现象越发显著,且推进速度越快应力峰值越大;煤岩层的位移沉降规律经历了积水影响异常区、工作面沉降影响区以及上下煤层沉降贯通区3个阶段,工作面推进速度越快煤层开采区域位移沉降量就越大;水压力随着工作面推进速度的增加而略有增大,但不同的推进速度对煤层开采水力渗流影响不大;随着工作面与积水区距离逐渐缩短,最终诱发上部积水异常范围产生塑性区并与下部煤层贯通;工作面推进速度越快开采扰动产生的煤岩层损伤范围就越大,塑性应变峰值同样增大。
For the safe mining of No.64 coal seam affected by water accumulation in goaf in Longhu Coal Mine,the influence law of the advancing speed of the working face on the stability of coal and rock strata under the influence of water accumulation in goaf was analyzed based on fluid-solid coupling and elastic-plastic mechanics theories,indoor mechanical tests,numerical simulation and other methods.The results show that as the working face advances,the stress concentration at the working face becomes more and more significant,and the stress peak is increasing with the advancing speed;the displacement settlement law of coal and rock strata goes through three stages:the anomaly area affected by water accumulation,the influenced area by the settlement of the working face and the settlement penetration area of the upper and lower coal seams,and the displacement settlement of the coal seam mining area is increasing with the advancing speed;the water pressure increases slightly with the advancing speed of the working face,while different advancing speed has little influence on hydraulic seepage in coal seam mining;as the distance between the working face and the water accumulation area gradually shortens,the upper water accumulation abnormal range is finally induced to produce a plastic zone and penetrate with the lower coal seam;the coal and rock strata damage range generated by mining disturbance and the peak plastic strain both increase with the advancing speed of the working face.
作者
金珠鹏
徐亚明
JIN Zhupeng;XU Yaming(School of Mining Engineering,Heilongjiang University of Science and Technology,Harbin,Heilongjiang 150022,China)
出处
《中国煤炭》
2023年第8期26-33,共8页
China Coal
基金
黑龙江省“揭榜挂帅”科技攻关项目(2021ZXJ02A03,2021ZXJ02A04)。
关键词
采空区积水
数值模拟
工作面推进速度
煤岩层稳定性
应力集中
位移沉降
water accumulation in goaf
numerical simulation
advancing speed of working face
stability of coal and rock strata
stress concentration
displacement settlement
